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Firefox 65 for Mac lost all New Tab Top Sites and will not populate when I try to fix

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Firefox has upgraded a few times on me in the last week or so--and my longstanding Top Sites on a New Tab disappeared. Moreover, when I try and repopulate the Top Sites on a New Tab (entering a name and url), it is not displayed. It's as if the Top Sites New Tab was locked. I am using Mac Os 10.13.1 and Firefox Quantum 65.0.1

Firefox has upgraded a few times on me in the last week or so--and my longstanding Top Sites on a New Tab disappeared. Moreover, when I try and repopulate the Top Sites on a New Tab (entering a name and url), it is not displayed. It's as if the Top Sites New Tab was locked. I am using Mac Os 10.13.1 and Firefox Quantum 65.0.1

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Were these pages pinned to tiles?

You can check this pref on the about:config page if the tabs were pinned.

  • browser.newtabpage.pinned stores websites that you have pinned to a tile.

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.